以编程方式滚动 ScrollView 以专注于按钮或视图 - Android

Question

I have an Activity that has a ScrollView of 125 buttons. The 125 buttons are Levels in my game that slowly get unlocked (think of Candy Crush Saga). Right now if the user is on the level, let's say, 88 of 125 then the user has to manually scroll all the way down to button 88.

My question is, how would I make it so that when the Activity loads, it automatically scrolls down and centers the ScrollView on a certain button?

Below is my code of how the buttons are created and populated programmatically.

ScrollView scrollView;

@Override
public void onCreate(Bundle savedInstanceState) {


    LinearLayout lay = (LinearLayout)findViewById(R.id.linearlayout);

    for(int i = 0; i < 125; i++) {

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0);
        params.weight = 1;
        params.gravity = Gravity.CENTER;

        if(i == 0) {
            TextView textview = new TextView(this);
            textview.setLayoutParams(params);
            textview.setTextSize(15);
            textview.setText(c.getResources().getString(R.string.l1to5));

            TextView textview2 = new TextView(this);
            textview2.setLayoutParams(params);
            textview.setTextSize(15);
            textview2.setText(c.getResources().getString(R.string.goal100));

            TextView textview3 = new TextView(this);
            textview3.setLayoutParams(params);
            textview.setTextSize(15);
            textview3.setText(c.getResources().getString(R.string.catRandom));

            if((getResources().getConfiguration().screenLayout & 
                Configuration.SCREENLAYOUT_SIZE_MASK) == 
                Configuration.SCREENLAYOUT_SIZE_LARGE) {
                    textview.setTextSize(22);
                    textview2.setTextSize(22);
                    textview3.setTextSize(22);
            } else if((getResources().getConfiguration().screenLayout & 
                Configuration.SCREENLAYOUT_SIZE_MASK) == 
                Configuration.SCREENLAYOUT_SIZE_XLARGE) {
                    textview.setTextSize(22);
                    textview2.setTextSize(22);
                    textview3.setTextSize(22);
            }

            lay.addView(textview);
            lay.addView(textview2);
            lay.addView(textview3);     

            View ruler = new View(this);
            ruler.setBackgroundColor(0xFFC2BEBF);
            lay.addView(ruler, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2));
        }

        if(i == 5) {

 //  ....

}



        Button button = new Button(this);
        int _id = getResources().getIdentifier("b" + (i + 1), "id", this.getPackageName());
        button.setTag(_id);
        button.setLayoutParams(params);

        if((getResources().getConfiguration().screenLayout & 
            Configuration.SCREENLAYOUT_SIZE_MASK) == 
            Configuration.SCREENLAYOUT_SIZE_LARGE) {
                button.setTextSize(22);
        } else if((getResources().getConfiguration().screenLayout & 
            Configuration.SCREENLAYOUT_SIZE_MASK) == 
            Configuration.SCREENLAYOUT_SIZE_XLARGE) {
                button.setTextSize(22);
        }

        button.setText("Level " + (i + 1));
        final int x = i + 1;
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                singleton.setLevelJustPlayed(x);
                // ...
                } else {
                 // ...
                    Intent intent = new Intent(Levels.this, Categories.class);
                    startActivity(intent);
                }
            }
        });

        lay.addView(button);

        if(singleton.getLevel() >= (i + 1)) {
            button.setEnabled(true);
        } else {
            button.setEnabled(false);
        }
    }
// end the onCreate() method

Answer 1

尝试

yourScrollView.scrollTo(0, (int) button.getY());

Answer 2

对于 Kotlin 用户

your_scrollview.post( { your_scrollview.scrollTo(0, your_view_inside_SV.getY().toInt()) })